Blood in puppy stool after vaccination. When to call vet. Blood in your puppy's stool A puppy pooping blood is medically referred to as hematochezia or melena. It is important to act quickly and take the right measures to protect your puppy's health. If your Like any other medication, vaccines can sometimes cause side effects in our pets. From infections to dietary issues, urgent insights for worried pet owners! Seek care swiftly. Today, our New Hope vets discuss some possible causes of Vaccines mainly result in minor behavioral changes in your puppy, including sleeping more or seeking attention less often. Find out what blood in dog poop looks like, the common causes and Discover the causes & solutions for blood in puppy's stool. Learn what you can do and what the causes are. Here are some common ways Because vaccines work by stimulating the immune system, the side effects of rabies vaccine in dogs are usually due to a stimulated immune system. Dogs, cats and ferrets that are apparently healthy should be confined and observed for 10 days after an exposure incident, regardless of the animal’s rabies vaccination status.